Summary:
Everything you need to know about the PCI Express connection: how it works, versions, slots, and more.

Here is a snippet:
"Since the first PC, launched in 1981, the computer has had expansion slots where you can install additional cards to add capabilities not available on the motherboard of the computer. Currently, the most common type of expansion slot available is called PCI Express. In this tutorial, you will learn everything you need to know about this kind of connection: how it works, versions, slots, and more."